金刚石-硬质合金系统超高压烧结过程的X射线衍射研究  

X-ray diffraction study on HP/HT sitering process of diamond on the substrate of cobalt-tungsten carbide

作　　者：邓福铭[1,2] 陈启武[1] 卢学军[3] 刘伟志[3] 徐国军[3] 

机构地区：[1]中国矿业大学材料科学与工程系 [2]黑龙江科技学院,哈尔滨150027 [3]北京市电加工研究所

出　　处：《粉末冶金技术》2004年第4期205-209,共5页Powder Metallurgy Technology

基　　金：国家自然科学基金项目 (5 0 342 0 1 7) ;北京市自然科学基金项目 (2 0 4 2 0 1 9)

摘　　要：对金刚石 -硬质合金系统不同烧结阶段快速冷却固化的实验样品的X射线衍射分析结果表明 ,金刚石 -硬质合金系统高压烧结经历了金刚石粉末超高压破碎、金刚石表面石墨化、金刚石溶解 -析出以及金刚石聚晶结构形成和长大等一系列复杂的烧结过程。进一步计算结果表明 ,在 5 .8GPa ,1 4 0 0℃超高压烧结过程中 ,碳在钴熔体中的饱和溶解度为 3.6 % ,析出的金刚石微晶的平均粒度为 0 .0 5 9μm。The quick quenched PDC samples sintered under high pressure of 5.8 GPa and at different temperature from 1300℃to 1600℃ were analyzed by XRD. It was found that the diamond diffraction peaks changed from widening to sharpening and finally to widening, the graphite (002) peaks changed from the strong to the weak and then disappeared, and the cobalt (311) peak separated from diamond (311) peak to a relative lower angle position and then to returning to overlapping position as the sintering temperature increasing from 1300℃to 1500℃. This revealed that the sintering process of PDC experienced diamond crushing, surface graphitization and crystallization of the dissolution and precipitation processes. The calculation results from the XRD data showed that the saturated solubility of carbon in the cobalt melt was about 3.6% and the grain size of the precipitated crystallites was about 0.059μm under 5.8 GPa and at 1400℃.

关 键 词：聚晶金刚石复合片 PDC 烧结 X射线衍射 金刚石 硬质合金 

分 类 号：TQ163[化学工程—高温制品工业]